﻿// This file is part of DesktopGap (http://desktopgap.codeplex.com)
// Copyright (c) rubicon IT GmbH, Vienna, and contributors
// 
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//
// Additional permissions are listed in the file DesktopGap_exceptions.txt.
// 

using System;
using System.Windows.Forms;

namespace DesktopGap.Clients.Windows.WebBrowser.Util
{
  public class DocumentIdentifier
  {
    private const string c_getDocumentIdentification = "DesktopGap_RetrieveID";
    private const string c_addDocumentIdentification = "DesktopGap_AssignID";

    public static HtmlDocumentHandle GetOrCreateDocumentHandle (HtmlDocument htmlDocument)
    {
      var guidObj = htmlDocument.InvokeScript (c_getDocumentIdentification);

      var docID = guidObj != null ? new HtmlDocumentHandle (Guid.Parse (guidObj.ToString())) : new HtmlDocumentHandle (Guid.NewGuid());

      htmlDocument.InvokeScript (c_addDocumentIdentification, new object[] { docID.ToString() });
      return docID;
    }
  }
}